Description of the device :
As soon as a cable is cut, a drum revolves rapidly winding a cable up. Rapid revolution of the drum generates centrifugal force. The centrifugal force makes a Ratchet on a spring case pushed out and the ratchet sticks in a wheel fixed on a cover, stopping the revolution of the drum.

Features :
In case that a cable installed in a Spring balancer is cut or a suspended tool is disengaged, the cable will snap back due to the tension of spring involved in a Spring balancer, causing the dangerous situation such as the in jury to personnel etc.
This new device has developed to protect personnel from such the danger.